[PATCH 2/3] arch: arm: mach-cns3xxx: Add gpiolib support
From: Tommy Lin
Date: Thu Jul 28 2011 - 05:50:11 EST
This patch makes CNS3XXX platform support gpiolib. Users can
configure GPIO via gpiolib APIs easily on CNS3XXX platform.
Signed-off-by: Tommy Lin <tommy.lin.1101@xxxxxxxxx>
---
arch/arm/Kconfig | 1 +
arch/arm/configs/cns3420vb_defconfig | 1 +
arch/arm/mach-cns3xxx/Makefile | 1 +
arch/arm/mach-cns3xxx/cns3420vb.c | 48 ++
arch/arm/mach-cns3xxx/gpio.c | 692 ++++++++++++++++++++++++++
arch/arm/mach-cns3xxx/include/mach/cns3xxx.h | 10 +-
arch/arm/mach-cns3xxx/include/mach/gpio.h | 63 +++
7 files changed, 814 insertions(+), 2 deletions(-)
create mode 100644 arch/arm/mach-cns3xxx/gpio.c
create mode 100644 arch/arm/mach-cns3xxx/include/mach/gpio.h
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 09ebf0b..ea48dd0 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -333,6 +333,7 @@ config ARCH_CNS3XXX
select ARM_GIC
select MIGHT_HAVE_PCI
select PCI_DOMAINS if PCI
+ select ARCH_REQUIRE_GPIOLIB
help
Support for Cavium Networks CNS3XXX platform.
diff --git a/arch/arm/configs/cns3420vb_defconfig b/arch/arm/configs/cns3420vb_defconfig
index 313627a..c83d14c 100644
--- a/arch/arm/configs/cns3420vb_defconfig
+++ b/arch/arm/configs/cns3420vb_defconfig
@@ -52,6 +52,7 @@ CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_LEGACY_PTY_COUNT=16
# CONFIG_HW_RANDOM is not set
# CONFIG_HWMON is not set
+CONFIG_GPIO_SYSFS=y
# CONFIG_VGA_CONSOLE is not set
# CONFIG_HID_SUPPORT is not set
# CONFIG_USB_SUPPORT is not set
diff --git a/arch/arm/mach-cns3xxx/Makefile b/arch/arm/mach-cns3xxx/Makefile
index 11033f1..7bb9c88 100644
--- a/arch/arm/mach-cns3xxx/Makefile
+++ b/arch/arm/mach-cns3xxx/Makefile
@@ -1,3 +1,4 @@
+obj-y += gpio.o
obj-$(CONFIG_ARCH_CNS3XXX) += core.o pm.o devices.o
obj-$(CONFIG_PCI) += pcie.o
obj-$(CONFIG_MACH_CNS3420VB) += cns3420vb.o
diff --git a/arch/arm/mach-cns3xxx/cns3420vb.c b/arch/arm/mach-cns3xxx/cns3420vb.c
index 3e7d149..34c4a87 100644
--- a/arch/arm/mach-cns3xxx/cns3420vb.c
+++ b/arch/arm/mach-cns3xxx/cns3420vb.c
@@ -24,6 +24,7 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/physmap.h>
#include <linux/mtd/partitions.h>
+#include <linux/proc_fs.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
@@ -158,10 +159,55 @@ static struct platform_device cns3xxx_usb_ohci_device = {
},
};
+/* GPIO */
+static struct resource cns3xxx_gpio_resources[] = {
+ [0] = {
+ .start = IRQ_CNS3XXX_GPIOA,
+ .end = IRQ_CNS3XXX_GPIOA,
+ .flags = IORESOURCE_IRQ,
+ .name = "GPIOA"
+ },
+ [1] = {
+ .start = CNS3XXX_GPIOA_BASE_VIRT,
+ .end = CNS3XXX_GPIOA_BASE_VIRT + 0x44,
+ .flags = IORESOURCE_MEM,
+ .name = "GPIOA",
+ },
+ [2] = {
+ .start = IRQ_CNS3XXX_GPIOB,
+ .end = IRQ_CNS3XXX_GPIOB,
+ .flags = IORESOURCE_IRQ,
+ .name = "GPIOB"
+ },
+ [3] = {
+ .start = CNS3XXX_GPIOB_BASE_VIRT,
+ .end = CNS3XXX_GPIOB_BASE_VIRT + 0x44,
+ .flags = IORESOURCE_MEM,
+ .name = "GPIOB",
+ },
+ [4] = {
+ .start = CNS3XXX_MISC_BASE_VIRT,
+ .end = CNS3XXX_MISC_BASE_VIRT + 0x800,
+ .flags = IORESOURCE_MEM,
+ .name = "MISC"
+ },
+};
+
+static struct platform_device cns3xxx_gpio_device = {
+ .name = "cns3xxx-gpio",
+ .id = -1,
+ .num_resources = ARRAY_SIZE(cns3xxx_gpio_resources),
+ .resource = cns3xxx_gpio_resources,
+};
+
+
+struct proc_dir_entry *cns3xxx_proc_dir;
+
/*
* Initialization
*/
static struct platform_device *cns3420_pdevs[] __initdata = {
+ &cns3xxx_gpio_device,
&cns3420_nor_pdev,
&cns3xxx_usb_ehci_device,
&cns3xxx_usb_ohci_device,
@@ -176,6 +222,8 @@ static void __init cns3420_init(void)
cns3xxx_ahci_init();
cns3xxx_sdhci_init();
+ cns3xxx_proc_dir = proc_mkdir("cns3xxx", NULL);
+
pm_power_off = cns3xxx_power_off;
}
diff --git a/arch/arm/mach-cns3xxx/gpio.c b/arch/arm/mach-cns3xxx/gpio.c
new file mode 100644
index 0000000..cafb65f
--- /dev/null
+++ b/arch/arm/mach-cns3xxx/gpio.c
@@ -0,0 +1,692 @@
+/*******************************************************************************
+ *
+ * arch/arm/mach-cns3xxx/gpio.c
+ *
+ * GPIO driver for the CNS3XXX SOCs
+ *
+ * Copyright (c) 2011 Cavium
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, Version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
+ * NONINFRINGEMENT. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or
+ * visit http://www.gnu.org/licenses/.
+ *
+ * This file may also be available under a different license from Cavium.
+ * Contact Cavium for more information
+ *
+ ******************************************************************************/
+
+#include <linux/platform_device.h>
+#include <linux/proc_fs.h>
+#include <linux/io.h>
+
+#include <mach/gpio.h>
+#include <mach/cns3xxx.h>
+
+#include <asm/mach/irq.h>
+
+#define CONFIG_GPIO_CNS3XXX_DEBUG
+
+#ifdef CONFIG_GPIO_CNS3XXX_DEBUG
+#define __pr_debug(fmt, args...) printk(KERN_ERR fmt, ##args)
+#else
+#define __pr_debug(fmt, args...)
+#endif
+
+
+#ifdef CONFIG_DEBUG_FS
+static void cns3xxx_dbg_show(struct seq_file *s, struct gpio_chip *chip);
+#else
+#define cns3xxx_dbg_show NULL
+#endif
+
+#define GPIO_PROC_NAME "gpio"
+static struct proc_dir_entry *proc_cns3xxx_gpio;
+static struct irq_chip cns3xxx_gpio_irq_chip;
+
+struct chog_gpio_chip {
+ struct gpio_chip chip;
+ int irq;
+ void __iomem *reg_base;
+ void __iomem *reg_sharepin_en;
+};
+
+#define INIT_CHOG_GPIO_CHIP(name, base_no, nr_gpio) \
+ { \
+ .chip = { \
+ .label = name, \
+ .owner = THIS_MODULE, \
+ .request = cns3xxx_request, \
+ .direction_input = cns3xxx_direction_in, \
+ .direction_output = cns3xxx_direction_out,\
+ .get = cns3xxx_get, \
+ .set = cns3xxx_set, \
+ .to_irq = cns3xxx_to_irq, \
+ .dbg_show = cns3xxx_dbg_show, \
+ .base = base_no, \
+ .ngpio = nr_gpio, \
+ .can_sleep = 0, \
+ }, \
+ }
+
+
+#define to_chog_gpio_chip(c) container_of(c, struct chog_gpio_chip, chip)
+#define nr_banks (sizeof(cns3xxx_gchip)/sizeof(struct chog_gpio_chip))
+
+/* The CNS3XXX GPIO pins are shard with special functions which is described in
+ * the following table. "none" in this table represent the corresponding pins
+ * are dedicate GPIO.
+ */
+const char *sharepin_desc[] = {
+ /* GPIOA group */
+/* 0 */ "none", "none", "SD_PWR_ON", "OTG_DRV_VBUS",
+/* 4 */ "Don't use", "none", "none", "none",
+/* 8 */ "CIM_nOE", "LCD_Power", "SMI_nCS3", "SMI_nCS2",
+/* 12 */ "SMI_Clk", "SMI_nADV", "SMI_CRE", "SMI_Addr[26]",
+/* 16 */ "SD_nCD", "SD_nWP", "SD_CLK", "SD_CMD",
+/* 20 */ "SD_DT[7]", "SD_DT[6]", "SD_DT[5]", "SD_DT[4]",
+/* 24 */ "SD_DT[3]", "SD_DT[2]", "SD_DT[1]", "SD_DT[0]",
+/* 28 */ "SD_LED", "UR_RXD1", "UR_TXD1", "UR_RTS2",
+ /* GPIOB group */
+/* 0 */ "UR_CTS2", "UR_RXD2", "UR_TXD2", "PCMCLK",
+/* 4 */ "PCMFS", "PCMDT", "PCMDR", "SPInCS1",
+/* 8 */ "SPInCS2", "SPICLK", "SPIDT", "SPIDR",
+/* 12 */ "SCL", "SDA", "GMII2_CRS", "GMII2_COL",
+/* 16 */ "RGMII1_CRS", "RGMII1_COL", "RGMII0_CRS", "RGMII0_COL",
+/* 20 */ "MDC", "MDIO", "I2SCLK", "I2SFS",
+/* 24 */ "I2SDT", "I2SDR", "ClkOut", "Ext_Intr2",
+/* 28 */ "Ext_Intr1", "Ext_Intr0", "SATA_LED1", "SATA_LED0",
+};
+
+struct cns3xxx_regs {
+ char *name;
+ void __iomem *addr;
+ u32 offset;
+};
+
+struct cns3xxx_regs gpio_regs[] = {
+ {"Data Out", 0, GPIO_OUTPUT_OFFSET},
+ {"Data In", 0, GPIO_INPUT_OFFSET},
+ {"Direction", 0, GPIO_DIR_OFFSET},
+ {"Interrupt Enable", 0, GPIO_INTR_ENABLE_OFFSET},
+ {"Interrupt Raw Status", 0, GPIO_INTR_RAW_STATUS_OFFSET},
+ {"Interrupt Masked Status", 0, GPIO_INTR_MASKED_STATUS_OFFSET},
+ {"Interrupt Level Trigger", 0, GPIO_INTR_TRIGGER_METHOD_OFFSET},
+ {"Interrupt Both Edge", 0, GPIO_INTR_TRIGGER_BOTH_EDGES_OFFSET},
+ {"Interrupt Falling Edge", 0, GPIO_INTR_TRIGGER_TYPE_OFFSET},
+ {"Interrupt MASKED", 0, GPIO_INTR_MASK_OFFSET},
+ {"GPIO Bounce Enable", 0, GPIO_BOUNCE_ENABLE_OFFSET},
+ {"GPIO Bounce Prescale", 0, GPIO_BOUNCE_PRESCALE_OFFSET},
+};
+
+struct cns3xxx_regs misc_regs[] = {
+ {"Drive Strength Register A", MISC_IO_PAD_DRIVE_STRENGTH_CTRL_A},
+ {"Drive Strength Register B", MISC_IO_PAD_DRIVE_STRENGTH_CTRL_B},
+ {"Pull Up/Down Ctrl A[15:0]", MISC_GPIOA_15_0_PULL_CTRL_REG},
+ {"Pull Up/Down Ctrl A[31:16]", MISC_GPIOA_16_31_PULL_CTRL_REG},
+ {"Pull Up/Down Ctrl B[15:0]", MISC_GPIOB_15_0_PULL_CTRL_REG},
+ {"Pull Up/Down Ctrl B[31:16]", MISC_GPIOB_16_31_PULL_CTRL_REG},
+};
+
+
+static int cns3xxx_request(struct gpio_chip *chip, unsigned offset)
+{
+ /* GPIOA4 is reserved for chip bonding configuration. Please don't use
+ * and configure GPIOA4.
+ */
+ if ((strcmp(chip->label, "GPIOA") == 0) && (offset == 4))
+ return -EINVAL;
+ return 0;
+}
+
+/*
+ * Configure the GPIO line as an input.
+ */
+static int cns3xxx_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+ struct chog_gpio_chip *cns3xxx_gpio = to_chog_gpio_chip(chip);
+ u32 reg;
+
+ /* Clear corresponding register bit to set as input pin. */
+ reg = readl(cns3xxx_gpio->reg_base + GPIO_DIR_OFFSET);
+ reg &= ~(1 << offset);
+ writel(reg, cns3xxx_gpio->reg_base + GPIO_DIR_OFFSET);
+
+ return 0;
+}
+
+/*
+ * Set the state of an output GPIO line.
+ */
+static void cns3xxx_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct chog_gpio_chip *cns3xxx_gpio = to_chog_gpio_chip(chip);
+
+ if (value)
+ /* Write 1 to set corresponding bit output "HIGH"
+ * Multi-bit write is allowed. Write 0 makes no change.
+ */
+ writel(1 << offset,
+ cns3xxx_gpio->reg_base + GPIO_BIT_SET_OFFSET);
+ else
+ /* Write 1 to set corresponding bit output "LOW"
+ * Multi-bit write is allowed. Write 0 makes no change.
+ */
+ writel(1 << offset,
+ cns3xxx_gpio->reg_base + GPIO_BIT_CLEAR_OFFSET);
+}
+
+/*
+ * Configure the GPIO line as an output, with default state.
+ */
+static int cns3xxx_direction_out(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct chog_gpio_chip *cns3xxx_gpio = to_chog_gpio_chip(chip);
+ u32 reg;
+
+ /* Set corresponding register bit to set as output pin. */
+ reg = readl(cns3xxx_gpio->reg_base + GPIO_DIR_OFFSET);
+ reg |= 1 << offset;
+ writel(reg, cns3xxx_gpio->reg_base + GPIO_DIR_OFFSET);
+
+ cns3xxx_set(chip, offset, value);
+
+ return 0;
+}
+
+/*
+ * Read the state of a GPIO line.
+ */
+static int cns3xxx_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct chog_gpio_chip *cns3xxx_gpio = to_chog_gpio_chip(chip);
+ u32 reg;
+ int ret;
+
+ reg = readl(cns3xxx_gpio->reg_base + GPIO_INPUT_OFFSET);
+ ret = reg & (1 << offset);
+
+ return ret;
+}
+
+/*
+ * GPIO interrtups are remapped to unused irq number.
+ * The remapped GPIO IRQ number start from NR_IRQS_CNS3XXX (96). Here is the
+ * table of GPIO to irq mapping table.
+ *
+ * GPIOA GPIOB | GPIOA GPIOB
+ * No. IRQ IRQ | No. IRQ IRQ
+ * 0 96 128 | 16 112 144
+ * 1 97 129 | 17 113 145
+ * 2 98 130 | 18 114 146
+ * 3 99 131 | 19 115 147
+ * 4 100 132 | 20 116 148
+ * 5 101 133 | 21 117 149
+ * 6 102 134 | 22 118 150
+ * 7 103 135 | 23 119 151
+ * 8 104 136 | 24 120 152
+ * 9 105 137 | 25 121 153
+ * 10 106 138 | 26 122 154
+ * 11 107 139 | 27 123 155
+ * 12 108 140 | 28 124 156
+ * 13 109 141 | 29 125 157
+ * 14 110 142 | 30 126 158
+ * 15 111 143 | 31 127 159
+ */
+static int cns3xxx_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ struct chog_gpio_chip *cns3xxx_gpio = to_chog_gpio_chip(chip);
+
+ return offset + NR_IRQS_CNS3XXX + cns3xxx_gpio->chip.base;
+}
+
+static unsigned cns3xxx_irq_to_gpio_offset(struct gpio_chip *chip, int irq)
+{
+ struct chog_gpio_chip *cns3xxx_gpio = to_chog_gpio_chip(chip);
+
+ return irq - NR_IRQS_CNS3XXX - cns3xxx_gpio->chip.base;
+}
+
+int cns3xxx_gpio_set_irq_type(struct irq_data *data, unsigned int type)
+{
+ struct gpio_chip *chip = data->chip_data;
+ void __iomem *base = to_chog_gpio_chip(chip)->reg_base;
+ unsigned offset;
+ u32 reg_level, reg_both, reg_low, index;
+
+ offset = cns3xxx_irq_to_gpio_offset(chip, data->irq);
+ index = 1 << offset;
+
+ reg_level = readl(base + GPIO_INTR_TRIGGER_METHOD_OFFSET);
+ reg_both = readl(base + GPIO_INTR_TRIGGER_BOTH_EDGES_OFFSET);
+ reg_low = readl(base + GPIO_INTR_TRIGGER_TYPE_OFFSET);
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ reg_level &= ~index;
+ reg_both &= ~index;
+ reg_low &= ~index;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ reg_level &= ~index;
+ reg_both &= ~index;
+ reg_low |= index;
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ reg_level &= ~index;
+ reg_both |= index;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ reg_level |= index;
+ reg_low |= index;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ reg_level |= index;
+ reg_low &= ~index;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ cns3xxx_direction_in(chip, offset);
+ writel(reg_level, base + GPIO_INTR_TRIGGER_METHOD_OFFSET);
+ writel(reg_both, base + GPIO_INTR_TRIGGER_BOTH_EDGES_OFFSET);
+ writel(reg_low, base + GPIO_INTR_TRIGGER_TYPE_OFFSET);
+
+ return 0;
+}
+
+static void cns3xxx_irq_enable(struct irq_data *data)
+{
+ struct gpio_chip *chip = data->chip_data;
+ void __iomem *base = to_chog_gpio_chip(chip)->reg_base;
+ unsigned offset = cns3xxx_irq_to_gpio_offset(chip, data->irq);
+ u32 reg;
+
+ reg = readl(base + GPIO_INTR_ENABLE_OFFSET);
+ reg |= (1 << offset);
+ writel(reg, base + GPIO_INTR_ENABLE_OFFSET);
+}
+
+static void cns3xxx_irq_disable(struct irq_data *data)
+{
+ struct gpio_chip *chip = data->chip_data;
+ void __iomem *base = to_chog_gpio_chip(chip)->reg_base;
+ unsigned offset = cns3xxx_irq_to_gpio_offset(chip, data->irq);
+ u32 reg;
+
+ reg = readl(base + GPIO_INTR_ENABLE_OFFSET);
+ reg &= ~(1 << offset);
+ writel(reg, base + GPIO_INTR_ENABLE_OFFSET);
+}
+
+static void cns3xxx_gpio_mask(struct irq_data *data)
+{
+ struct gpio_chip *chip = data->chip_data;
+ void __iomem *base = to_chog_gpio_chip(chip)->reg_base;
+ unsigned offset = cns3xxx_irq_to_gpio_offset(chip, data->irq);
+ u32 reg;
+
+ reg = readl(base + GPIO_INTR_MASK_OFFSET);
+ reg |= (1 << offset);
+ writel(reg, base + GPIO_INTR_MASK_OFFSET);
+}
+
+static void cns3xxx_gpio_unmask(struct irq_data *data)
+{
+ struct gpio_chip *chip = data->chip_data;
+ void __iomem *base = to_chog_gpio_chip(chip)->reg_base;
+ unsigned offset = cns3xxx_irq_to_gpio_offset(chip, data->irq);
+ u32 reg;
+
+ reg = readl(base + GPIO_INTR_MASK_OFFSET);
+ reg &= ~(1 << offset);
+ writel(reg, base + GPIO_INTR_MASK_OFFSET);
+}
+
+static struct irq_chip cns3xxx_gpio_irq_chip = {
+ .name = "GPIO",
+ .irq_enable = cns3xxx_irq_enable,
+ .irq_disable = cns3xxx_irq_disable,
+ .irq_mask = cns3xxx_gpio_mask,
+ .irq_unmask = cns3xxx_gpio_unmask,
+ .irq_set_type = cns3xxx_gpio_set_irq_type,
+};
+
+static struct chog_gpio_chip cns3xxx_gchip[] = {
+ /* label, base, ngpio */
+ INIT_CHOG_GPIO_CHIP("GPIOA", 0x00, MAX_GPIOA_NO),
+ INIT_CHOG_GPIO_CHIP("GPIOB", MAX_GPIOA_NO, MAX_GPIOB_NO),
+};
+
+
+static int cns3xxx_gpio_read_proc(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ int num = 0, i, nr_regs;
+
+ nr_regs = sizeof(gpio_regs)/sizeof(struct cns3xxx_regs);
+ num += sprintf(page + num,
+ "Register Description GPIOA GPIOB\n"
+ "==================== ===== =====\n");
+ num += sprintf(page + num, "%-26.26s: %08x %08x\n", "GPIO Disable",
+ readl(cns3xxx_gchip[0].reg_sharepin_en),
+ readl(cns3xxx_gchip[1].reg_sharepin_en));
+ for (i = 0; i < nr_regs; i++) {
+ num += sprintf(page + num, "%-26.26s: %08x %08x\n",
+ gpio_regs[i].name,
+ readl(cns3xxx_gchip[0].reg_base + gpio_regs[i].offset),
+ readl(cns3xxx_gchip[1].reg_base + gpio_regs[i].offset));
+ }
+
+ num += sprintf(page + num, "\n"
+ "Register Description Value\n"
+ "==================== =====\n");
+ nr_regs = sizeof(misc_regs)/sizeof(struct cns3xxx_regs);
+ for (i = 0; i < nr_regs; i++) {
+ num += sprintf(page + num, "%-26.26s: %08x\n",
+ misc_regs[i].name,
+ readl(misc_regs[i].addr));
+ }
+
+ return num;
+}
+
+/*
+ * Turn on corresponding shared pin function.
+ * Turn on shared pin function will also disable GPIO function. Related GPIO
+ * control registers are still accessable but not reflect to pin.
+ */
+int cns3xxx_sharepin_request(unsigned gpio, const char *label)
+{
+ struct gpio_chip *chip;
+ int i, reg, ret, offset = gpio;
+
+ ret = gpio_request(gpio, label);
+ if (ret) {
+ __pr_debug("gpio%d(%s) already in use! Err=%d\n",
+ gpio, label, ret);
+ return ret;
+ }
+
+ for (i = 0; i < nr_banks; i++) {
+ chip = &cns3xxx_gchip[i].chip;
+ if (offset > chip->ngpio) {
+ offset -= chip->ngpio;
+ continue;
+ }
+ reg = readl(cns3xxx_gchip[i].reg_sharepin_en);
+ reg |= (1 << offset);
+ writel(reg, cns3xxx_gchip[i].reg_sharepin_en);
+ __pr_debug("%s[%d] is occupied by %s function!\n",
+ chip->label, offset, sharepin_desc[gpio]);
+ break;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(cns3xxx_sharepin_request);
+
+/*
+ * Turn off corresponding share pin function.
+ */
+void cns3xxx_sharepin_free(unsigned gpio)
+{
+ struct gpio_chip *chip;
+ int i, reg, offset = gpio;
+
+ gpio_free(gpio);
+
+ for (i = 0; i < nr_banks; i++) {
+ chip = &cns3xxx_gchip[i].chip;
+ if (offset > chip->ngpio) {
+ offset -= chip->ngpio;
+ continue;
+ }
+ reg = readl(cns3xxx_gchip[i].reg_sharepin_en);
+ reg &= ~(1 << offset);
+ writel(reg, cns3xxx_gchip[i].reg_sharepin_en);
+ printk(KERN_INFO "%s[%d] share pin function (%s) disabled!\n",
+ chip->label, offset, sharepin_desc[gpio]);
+ break;
+ }
+}
+EXPORT_SYMBOL(cns3xxx_sharepin_free);
+
+
+#ifdef CONFIG_DEBUG_FS
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+static void cns3xxx_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+ struct chog_gpio_chip *cns3xxx_gpio = to_chog_gpio_chip(chip);
+ int i, is_out;
+ unsigned gpio;
+ const char *gpio_label;
+
+ for (i = 0; i < chip->ngpio; i++) {
+ gpio = chip->base + i;
+ gpio_label = gpiochip_is_requested(chip, i);
+ if (!gpio_label)
+ continue;
+ is_out = test_bit(i, cns3xxx_gpio->reg_base + GPIO_DIR_OFFSET);
+ seq_printf(s, " gpio-%-3d [%-20.20s] %s %s (%s%-2d)\n",
+ gpio, gpio_label,
+ is_out ? "out" : "in ",
+ chip->get(chip, i) ? "hi" : "lo",
+ chip->label, i);
+ }
+}
+
+static int cns3xxx_dbg_gpio_show_all(struct seq_file *s, void *unused)
+{
+ int i, j, is_out, disabled;
+ unsigned gpio;
+ const char *gpio_label;
+ struct gpio_chip *chip;
+
+ for (j = 0; j < nr_banks; j++) {
+ chip = &cns3xxx_gchip[j].chip;
+ seq_printf(s, " Label Mode Dir Value Note\n");
+ seq_printf(s, " ============================================================\n");
+ for (i = 0; i < chip->ngpio; i++) {
+ gpio = chip->base + i;
+ disabled = test_bit(i, cns3xxx_gchip[j].reg_sharepin_en);
+ gpio_label = gpiochip_is_requested(chip, i);
+ if (!gpio_label) {
+ if (disabled)
+ gpio_label = sharepin_desc[gpio];
+ else
+ gpio_label = "Not requested";
+ }
+ is_out = test_bit(i, cns3xxx_gchip[j].reg_base + GPIO_DIR_OFFSET);
+ seq_printf(s, " gpio-%-3d [%-20.20s] %-10.10s%s %s (%s%-2d)\n",
+ gpio, gpio_label,
+ disabled ? "Function" : "GPIO",
+ is_out ? "out" : "in ",
+ chip->get(chip, i) ? "hi" : "lo",
+ chip->label, i);
+ }
+ seq_printf(s, "\n");
+ }
+
+ return 0;
+}
+
+static int dbg_gpio_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, cns3xxx_dbg_gpio_show_all, &inode->i_private);
+}
+
+static const struct file_operations debug_fops = {
+ .open = dbg_gpio_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init cns3xxx_gpio_debuginit(void)
+{
+ (void) debugfs_create_file("gpio-cns3xxx", S_IRUGO,
+ NULL, NULL, &debug_fops);
+ return 0;
+}
+late_initcall(cns3xxx_gpio_debuginit);
+
+#endif /* CONFIG_DEBUG_FS */
+
+static void chained_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
+{
+ struct chog_gpio_chip *chip = irq_get_handler_data(irq);
+ struct irq_chip *ichip = irq_desc_get_chip(desc);
+ unsigned i;
+ int target_irq;
+ u32 status;
+
+ chained_irq_enter(ichip, desc);
+
+ status = readl(chip->reg_base + GPIO_INTR_MASKED_STATUS_OFFSET);
+
+ /* Clean System irq status */
+ writel(status, chip->reg_base + GPIO_INTR_CLEAR_OFFSET);
+
+ for (i = 0; i < chip->chip.ngpio; i++) {
+ if (status & (1 << i)) {
+ target_irq = cns3xxx_to_irq(&chip->chip, i);
+ printk(KERN_INFO "Invoke cascaded irq %d from irq %d\n",
+ target_irq, chip->irq);
+ generic_handle_irq(target_irq);
+ }
+ }
+
+ chained_irq_exit(ichip, desc);
+}
+
+static int __devinit gpio_probe(struct platform_device *pdev)
+{
+ int i, j, nr_gpios = 0, irq = 0;
+ struct resource *res;
+ void __iomem *misc_reg;
+
+ cns3xxx_pwr_clk_en(0x1 << PM_CLK_GATE_REG_OFFSET_GPIO);
+ cns3xxx_pwr_soft_rst(0x1 << PM_CLK_GATE_REG_OFFSET_GPIO);
+
+ if (cns3xxx_proc_dir) {
+ proc_cns3xxx_gpio = create_proc_entry(GPIO_PROC_NAME,
+ S_IFREG | S_IRUGO, cns3xxx_proc_dir) ;
+ if (proc_cns3xxx_gpio)
+ proc_cns3xxx_gpio->read_proc = cns3xxx_gpio_read_proc;
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "MISC");
+ if (res)
+ misc_reg = (void __iomem *)res->start;
+ else
+ return -ENODEV;
+
+ /* Scan and match GPIO resources */
+ for (i = 0; i < nr_banks; i++) {
+ /* Fetech GPIO base address */
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ cns3xxx_gchip[i].chip.label);
+ if (!res)
+ continue;
+ cns3xxx_gchip[i].reg_base = (void __iomem *)res->start;
+
+ /* Fetech GPIO interrupt number */
+ res = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
+ cns3xxx_gchip[i].chip.label);
+ if (!res)
+ continue;
+ irq = res->start;
+ cns3xxx_gchip[i].irq = irq;
+ __pr_debug("%s base=0x%08x, irq=%d",
+ cns3xxx_gchip[i].chip.label,
+ (u32)cns3xxx_gchip[i].reg_base, irq);
+
+ cns3xxx_gchip[i].chip.dev = &pdev->dev;
+ cns3xxx_gchip[i].reg_sharepin_en = misc_reg + 0x14 + i * 4;
+
+ gpiochip_add(&cns3xxx_gchip[i].chip);
+
+ /* Clear All Interrupt Status */
+ writel(0xFFFFFFFF, cns3xxx_gchip[i].reg_base +
+ GPIO_INTR_CLEAR_OFFSET);
+
+ /* Initial irq_chip to handle virtual GPIO irqs. */
+ for (j = 0; j < cns3xxx_gchip[i].chip.ngpio; j++) {
+ irq = cns3xxx_to_irq(&cns3xxx_gchip[i].chip, j);
+ irq_set_chip_and_handler(irq, &cns3xxx_gpio_irq_chip,
+ handle_simple_irq);
+ set_irq_flags(irq, IRQF_VALID);
+ irq_set_chip_data(irq, &cns3xxx_gchip[i]);
+ }
+ irq_set_chained_handler(cns3xxx_gchip[i].irq,
+ chained_gpio_irq_handler);
+ irq_set_handler_data(cns3xxx_gchip[i].irq,
+ &cns3xxx_gchip[i]);
+
+ nr_gpios += cns3xxx_gchip[i].chip.ngpio;
+ if (nr_gpios >= MAX_GPIO_NO)
+ break;
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int gpio_cns3xxx_suspend(struct platform_device *dev, pm_message_t state)
+{
+ __pr_debug("%s,%s,%d\n", __FILE__, __func__, __LINE__);
+
+ return 0;
+}
+
+static int gpio_cns3xxx_resume(struct platform_device *dev)
+{
+ __pr_debug("%s,%s,%d\n", __FILE__, __func__, __LINE__);
+
+ return 0;
+}
+#endif /* CONFIG_PM */
+
+static struct platform_driver gpio_driver = {
+ .probe = gpio_probe,
+#ifdef CONFIG_PM
+ .suspend = gpio_cns3xxx_suspend,
+ .resume = gpio_cns3xxx_resume,
+#endif /* CONFIG_PM */
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "cns3xxx-gpio",
+ },
+};
+
+int __init cns3xxx_gpio_init(void)
+{
+ return platform_driver_probe(&gpio_driver, gpio_probe);
+}
+
+void __exit cns3xxx_gpio_exit(void)
+{
+ if (proc_cns3xxx_gpio)
+ remove_proc_entry(GPIO_PROC_NAME, cns3xxx_proc_dir);
+}
+
+module_init(cns3xxx_gpio_init);
+module_exit(cns3xxx_gpio_exit);
+
+MODULE_LICENSE("GPL");
+
diff --git a/arch/arm/mach-cns3xxx/include/mach/cns3xxx.h b/arch/arm/mach-cns3xxx/include/mach/cns3xxx.h
index 191c8e5..217bb4d 100644
--- a/arch/arm/mach-cns3xxx/include/mach/cns3xxx.h
+++ b/arch/arm/mach-cns3xxx/include/mach/cns3xxx.h
@@ -624,9 +624,15 @@ int cns3xxx_cpu_clock(void);
#define NR_IRQS_CNS3XXX (IRQ_TC11MP_GIC_START + 64)
-#if !defined(NR_IRQS) || (NR_IRQS < NR_IRQS_CNS3XXX)
+#define MAX_GPIOA_NO 32
+#define MAX_GPIOB_NO 32
+#define MAX_GPIO_NO (MAX_GPIOA_NO + MAX_GPIOB_NO)
+
+#if !defined(NR_IRQS) || (NR_IRQS < (NR_IRQS_CNS3XXX + MAX_GPIO_NO))
#undef NR_IRQS
-#define NR_IRQS NR_IRQS_CNS3XXX
+#define NR_IRQS (NR_IRQS_CNS3XXX + MAX_GPIO_NO)
#endif
+extern struct proc_dir_entry *cns3xxx_proc_dir;
+
#endif /* __MACH_BOARD_CNS3XXX_H */
diff --git a/arch/arm/mach-cns3xxx/include/mach/gpio.h b/arch/arm/mach-cns3xxx/include/mach/gpio.h
new file mode 100644
index 0000000..22efca8
--- /dev/null
+++ b/arch/arm/mach-cns3xxx/include/mach/gpio.h
@@ -0,0 +1,63 @@
+/*******************************************************************************
+ *
+ * Copyright (c) 2011 Cavium
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, Version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
+ * NONINFRINGEMENT. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or
+ * visit http://www.gnu.org/licenses/.
+ *
+ * This file may also be available under a different license from Cavium.
+ * Contact Cavium for more information
+ *
+ ******************************************************************************/
+
+#ifndef _CNS3XXX_GPIO_H_
+#define _CNS3XXX_GPIO_H_
+
+#include <mach/cns3xxx.h>
+
+#define ARCH_NR_GPIOS MAX_GPIO_NO
+
+#include <asm-generic/gpio.h>
+
+#define GPIO_OUTPUT_OFFSET 0x00
+#define GPIO_INPUT_OFFSET 0x04
+#define GPIO_DIR_OFFSET 0x08
+#define GPIO_BIT_SET_OFFSET 0x10
+#define GPIO_BIT_CLEAR_OFFSET 0x14
+#define GPIO_INTR_ENABLE_OFFSET 0x20
+#define GPIO_INTR_RAW_STATUS_OFFSET 0x24
+#define GPIO_INTR_MASKED_STATUS_OFFSET 0x28
+#define GPIO_INTR_MASK_OFFSET 0x2C
+#define GPIO_INTR_CLEAR_OFFSET 0x30
+#define GPIO_INTR_TRIGGER_METHOD_OFFSET 0x34
+#define GPIO_INTR_TRIGGER_BOTH_EDGES_OFFSET 0x38
+#define GPIO_INTR_TRIGGER_TYPE_OFFSET 0x3C
+#define GPIO_BOUNCE_ENABLE_OFFSET 0x40
+#define GPIO_BOUNCE_PRESCALE_OFFSET 0x44
+
+
+#define gpio_get_value __gpio_get_value
+#define gpio_set_value __gpio_set_value
+#define gpio_cansleep __gpio_cansleep
+#define gpio_to_irq __gpio_to_irq
+
+#define GPIOA(n) n
+#define GPIOB(n) (MAX_GPIOA_NO + n)
+
+/* Function prototype */
+int cns3xxx_sharepin_request(unsigned gpio, const char *label);
+void cns3xxx_sharepin_free(unsigned gpio);
+
+#endif
+
--
1.7.6
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